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import * as websocket from "ws";

import { Server } from 'http';

import Offer from './class/offer';

import Answer from './class/answer';

import Candidate from './class/candidate';

// [{sessonId:[connectionId,...]}]

const clients: Map<WebSocket, Set<string>> = new Map<WebSocket, Set<string>>();

// [{connectionId:[sessionId1, sessionId2]}]

const connectionPair: Map<string, [WebSocket, WebSocket]> = new Map<string, [WebSocket, WebSocket]>();

// [{connectionId:Offer}]

const offers: Map<string, Offer> = new Map<string, Offer>();

// [{connectionId:Answer}]

const answers: Map<string, Answer> = new Map<string, Answer>();

// [{sessionId:[{connectionId:Candidate},...]}]

const candidates: Map<WebSocket, Map<string, Candidate[]>> = new Map<WebSocket, Map<string, Candidate[]>>();

function getOrCreateConnectionIds(settion: WebSocket): Set<string> {

let connectionIds = null;

if (!clients.has(settion)) {

connectionIds = new Set<string>();

clients.set(settion, connectionIds);

}

connectionIds = clients.get(settion);

return connectionIds;

}

export default class WSSignaling {

server: Server;

wss: websocket.Server;

isPrivate: boolean;

constructor(server: Server, mode: string) {

this.server = server;

this.wss = new websocket.Server({ server });

this.isPrivate = mode == "private";

this.wss.on('connection', (ws: WebSocket) => {

clients.set(ws, new Set<string>());

ws.onclose = (_event: CloseEvent) => {

const connectionIds = clients.get(ws);

connectionIds.forEach(connectionId => {

connectionPair.delete(connectionId);

offers.delete(connectionId);

answers.delete(connectionId);

});

clients.delete(ws);

candidates.delete(ws);

}

ws.onmessage = (event: MessageEvent) => {

// type: connect, disconnect JSON Schema

// connectionId: connect or disconnect connectionId

// type: offer, answer, candidate JSON Schema

// from: from connection id

// to: to connection id

// data: any message data structure

const msg = JSON.parse(event.data);

if (!msg || !this) {

return;

}

console.log(msg);

switch (msg.type) {

case "connect":

this.onConnect(ws, msg.connectionId);

break;

case "disconnect":

this.onDisconnect(ws, msg.connectionId);

break;

case "offer":

this.onOffer(ws, msg.data);

break;

case "answer":

this.onAnswer(ws, msg.data);

break;

case "candidate":

this.onCandidate(ws, msg.data);

break;

default:

break;

}

};

});

}

private onConnect(ws: WebSocket, connectionId: string) {

let peerExists = false;

if (this.isPrivate) {

if (connectionPair.has(connectionId)) {

const pair = connectionPair.get(connectionId);

if (pair[0] != null && pair[1] != null) {

ws.send(JSON.stringify({ type: "error", message: `${connectionId}: This connection id is already used.` }));

return;

} else if (pair[0] != null) {

connectionPair.set(connectionId, [pair[0], ws]);

peerExists = true;

}

} else {

connectionPair.set(connectionId, [ws, null]);

}

}

const connectionIds = getOrCreateConnectionIds(ws);

connectionIds.add(connectionId);

ws.send(JSON.stringify({ type: "connect", connectionId: connectionId, peerExists: peerExists }));

}

private onDisconnect(ws: WebSocket, connectionId: string) {

const connectionIds = clients.get(ws);

connectionIds.delete(connectionId);

if (connectionPair.has(connectionId)) {

const pair = connectionPair.get(connectionId);

const otherSessionWs = pair[0] == ws ? pair[1] : pair[0];

if (otherSessionWs) {

otherSessionWs.send(JSON.stringify({ type: "disconnect", connectionId: connectionId }));

}

}

connectionPair.delete(connectionId);

}

private onOffer(ws: WebSocket, message: any) {

const connectionId = message.connectionId as string;

const newOffer = new Offer(message.sdp, Date.now());

offers.set(connectionId, newOffer);

if (this.isPrivate) {

const pair = connectionPair.get(connectionId);

const otherSessionWs = pair[0] == ws ? pair[1] : pair[0];

if (otherSessionWs) {

otherSessionWs.send(JSON.stringify({ from: connectionId, to: "", type: "offer", data: newOffer }));

} else {

ws.send(JSON.stringify({ type: "error", message: `${connectionId}: This connection id is not ready other session.` }));

}

return;

}

connectionPair.set(connectionId, [ws, null]);

clients.forEach((_v, k) => {

if (k == ws) {

return;

}

k.send(JSON.stringify({ from: connectionId, to: "", type: "offer", data: newOffer }));

});

}

private onAnswer(ws: WebSocket, message: any) {

const connectionId = message.connectionId as string;

const connectionIds = getOrCreateConnectionIds(ws);

connectionIds.add(connectionId);

const newAnswer = new Answer(message.sdp, Date.now());

answers.set(connectionId, newAnswer);

let otherSessionWs = null;

if (this.isPrivate) {

const pair = connectionPair.get(connectionId);

otherSessionWs = pair[0] == ws ? pair[1] : pair[0];

} else {

const pair = connectionPair.get(connectionId);

otherSessionWs = pair[0];

connectionPair.set(connectionId, [otherSessionWs, ws]);

}

const mapCandidates = candidates.get(otherSessionWs);

if (mapCandidates) {

const arrayCandidates = mapCandidates.get(connectionId);

for (const candidate of arrayCandidates) {

candidate.datetime = Date.now();

}

}

if (this.isPrivate) {

otherSessionWs.send(JSON.stringify({ from: connectionId, to: "", type: "answer", data: newAnswer }));

return;

}

clients.forEach((_v, k) => {

if (k == ws) {

return;

}

k.send(JSON.stringify({ from: connectionId, to: "", type: "answer", data: newAnswer }));

});

}

private onCandidate(ws: WebSocket, message: any) {

const connectionId = message.connectionId;

if (!candidates.has(ws)) {

candidates.set(ws, new Map<string, Candidate[]>());

}

const map = candidates.get(ws);

if (!map.has(connectionId)) {

map.set(connectionId, []);

}

const arr = map.get(connectionId);

const candidate = new Candidate(message.candidate, message.sdpMLineIndex, message.sdpMid, Date.now());

arr.push(candidate);

if (this.isPrivate) {

const pair = connectionPair.get(connectionId);

const otherSessionWs = pair[0] == ws ? pair[1] : pair[0];

if (otherSessionWs) {

otherSessionWs.send(JSON.stringify({ from: connectionId, to: "", type: "candidate", data: candidate }));

}

return;

}

clients.forEach((_v, k) => {

if (k === ws) {

return;

}

k.send(JSON.stringify({ from: connectionId, to: "", type: "candidate", data: candidate }));

});

}

}